S
ECTION
Diagnostic codes
Use this chapter to interpret diagnostic codes, which are in the alert and test logs.
The alert log contains codes generated by ongoing checks during ventilation. The
test log contains codes generated by the power-on self-test (POST), the short self-
test (SST), the extended self-test (EST), and calibrations.
The logs also contain other information that can be useful when troubleshooting
the ventilator. Chapter 4 describes how to access and interpret these logs.
6.1 How to use this chapter
If the ventilator has declared a VENT INOP condition
, you must repair the
ventilator and then run and pass EST before ventilation can resume. To do so, first
cycle power to the ventilator. The ventilator will now let you access a limited set
of service menu functions only (see Chapter 4). Use the
EST
function to run the
extended self-test. The results of the EST run, the contents of the test and/or alert
logs, and other service menu functions will help you determine what to repair.
(The most recently detected error (the error that triggered the VENT INOP
condition) is stored in the test and/or alert log.)
Also review any other codes, all of which may help you more accurately pinpoint
the failed component. Be aware, however, that some codes may represent
transient failures, which may not recur. For some codes, particularly software and
some hardware failures, the ventilator tries to reset itself immediately after
detection of the error. The associated code will remain in memory even though
the ventilator may be successfully reset. Check the time and date stamp
associated with the code to determine its relevance.
If the ventilator has not declared a VENT INOP condition, and you are checking
the log for other reasons
, bear in mind that codes may represent transient
failures that may not require repair or they may represent software or hardware
errors that caused the ventilator to successfully reset itself. If the error condition
causes the ventilator to declare a VENT INOP condition, then that error must be
dealt with as described above.
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